After the German attacks on the Murmansk front ceased in the autumn of 1941, Varanger area gained increased importance as the base area for the forces on the Ishavs front. As mentioned above, two heavy coastal batteries were made available in connection with the defense of the area. These were landed on Kjelmsøya (24 cm) respectively, at the entrance to Bøkfjorden and Kibergnes (28 cm)

The Kiberg batteries were the largest coastal battery in Finnmark, and had the task of safeguarding the sea road against Petsamo, preventing enemy landings on the coastline, and in collaboration with Kjelmsøy battery preventing enemy seines from entering the Varangerfjord.

In connection with the immediate defense, 130 personnel and 880 fights were issued. (Mines).

The total strength of the fort was about 700 men at the turn of the year 1943/44. Of which a near-defense company.

The battery (3 / MAA 513) belonged to the Navy and was probably ready for battle in the fall of 1942.

The expansion of the battery area continued with the construction of posts, including reinforced concrete, large mountain systems with built-in brackets, barrier work, etc. During 1943, the support point was so strongly confirmed that from 25 March the same year, it became known as «Fort Kiberg».

As part of the fire management of the battery, a large measuring station was built on Domen and Falkeflauget, respectively. (between Kiberg and Langbunes).

A battery station was also connected to the battery station, which was probably also located on the Domen. In connection with Falkeflauget, 874 personnel mines were issued.

On February 16, 1943 a Russian submarine was lowered by the battery just outside Kiberg. The submarine was discovered when it attempted to torpedo the ferry boat «Alta» which lay by the dock in Kiberg. The torpedo that went straight on land did not detonate.

During the night and the morning of July 20, 1943, there was a struggle with Russian vessels just outside of Kiberg. The Russian force also included landlockers attempting to land on Molvik just north of the battery. The intentions were likely to attack the battery from the country side. However, the Russian vessels were taken under heavy fire from the Kibergs battery and the battery from Vardø and the attack was rejected. During the fire struggle between the batteries and the vessels, a force of approx. 700 men ready to enter the landing strength.

According to German fencing reports, it was approximately 25 smaller state-of-the-ferry vessels that sought to search into Molvik. A large part of these had come into the main battery’s death zone completely before they were rejected. The Kibergs battery was often exposed to aircraft attacks. Among other things, 13 Russian aircraft, 2 June 1943 and a number of times in 1944.

«Fort Kiberg» was blown on October 29, 1944, and the personnel evacuated with 3 miners escorted by hunters. In the East Sea, 350 men had to be transferred to hunters because of bad weather.